﻿/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * Active selection functions. (Gecko specific implementation)
 */

// Get the selection type (like document.select.type in IE).
FCKSelection.GetType = function()
{
    // By default set the type to "Text".
    var type = 'Text' ;

    // Check if the actual selection is a Control (IMG, TABLE, HR, etc...).

    var sel ;
    try { sel = this.GetSelection() ; } catch (e) {}

    if ( sel && sel.rangeCount == 1 )
    {
        var range = sel.getRangeAt(0) ;
        if ( range.startContainer == range.endContainer
            && ( range.endOffset - range.startOffset ) == 1
            && range.startContainer.nodeType == 1
            && FCKListsLib.StyleObjectElements[ range.startContainer.childNodes[ range.startOffset ].nodeName.toLowerCase() ] )
        {
            type = 'Control' ;
        }
    }

    return type ;
}

// Retrieves the selected element (if any), just in the case that a single
// element (object like and image or a table) is selected.
FCKSelection.GetSelectedElement = function()
{
    var selection = !!FCK.EditorWindow && this.GetSelection() ;
    if ( !selection || selection.rangeCount < 1 )
        return null ;

    var range = selection.getRangeAt( 0 ) ;
    if ( range.startContainer != range.endContainer || range.startContainer.nodeType != 1 || range.startOffset != range.endOffset - 1 )
        return null ;

    var node = range.startContainer.childNodes[ range.startOffset ] ;
    if ( node.nodeType != 1 )
        return null ;

    return node ;
}

FCKSelection.GetParentElement = function()
{
    if ( this.GetType() == 'Control' )
        return FCKSelection.GetSelectedElement().parentNode ;
    else
    {
        var oSel = this.GetSelection() ;
        if ( oSel )
        {
            // if anchorNode == focusNode, see if the selection is text only or including nodes.
            // if text only, return the parent node.
            // if the selection includes DOM nodes, then the anchorNode is the nearest container.
            if ( oSel.anchorNode && oSel.anchorNode == oSel.focusNode )
            {
                var oRange = oSel.getRangeAt( 0 ) ;
                if ( oRange.collapsed || oRange.startContainer.nodeType == 3 )
                    return oSel.anchorNode.parentNode ;
                else
                    return oSel.anchorNode ;
            }

            // looks like we're having a large selection here. To make the behavior same as IE's TextRange.parentElement(),
            // we need to find the nearest ancestor node which encapsulates both the beginning and the end of the selection.
            // TODO: A simpler logic can be found.
            var anchorPath = new FCKElementPath( oSel.anchorNode ) ;
            var focusPath = new FCKElementPath( oSel.focusNode ) ;
            var deepPath = null ;
            var shallowPath = null ;
            if ( anchorPath.Elements.length > focusPath.Elements.length )
            {
                deepPath = anchorPath.Elements ;
                shallowPath = focusPath.Elements ;
            }
            else
            {
                deepPath = focusPath.Elements ;
                shallowPath = anchorPath.Elements ;
            }

            var deepPathBase = deepPath.length - shallowPath.length ;
            for( var i = 0 ; i < shallowPath.length ; i++)
            {
                if ( deepPath[deepPathBase + i] == shallowPath[i])
                    return shallowPath[i];
            }
            return null ;
        }
    }
    return null ;
}

FCKSelection.GetBoundaryParentElement = function( startBoundary )
{
    if ( ! FCK.EditorWindow )
        return null ;
    if ( this.GetType() == 'Control' )
        return FCKSelection.GetSelectedElement().parentNode ;
    else
    {
        var oSel = this.GetSelection() ;
        if ( oSel && oSel.rangeCount > 0 )
        {
            var range = oSel.getRangeAt( startBoundary ? 0 : ( oSel.rangeCount - 1 ) ) ;

            var element = startBoundary ? range.startContainer : range.endContainer ;

            return ( element.nodeType == 1 ? element : element.parentNode ) ;
        }
    }
    return null ;
}

FCKSelection.SelectNode = function( element )
{
    var oRange = FCK.EditorDocument.createRange() ;
    oRange.selectNode( element ) ;

    var oSel = this.GetSelection() ;
    oSel.removeAllRanges() ;
    oSel.addRange( oRange ) ;
}

FCKSelection.Collapse = function( toStart )
{
    var oSel = this.GetSelection() ;

    if ( toStart == null || toStart === true )
        oSel.collapseToStart() ;
    else
        oSel.collapseToEnd() ;
}

// The "nodeTagName" parameter must be Upper Case.
FCKSelection.HasAncestorNode = function( nodeTagName )
{
    var oContainer = this.GetSelectedElement() ;
    if ( ! oContainer && FCK.EditorWindow )
    {
        try        { oContainer = this.GetSelection().getRangeAt(0).startContainer ; }
        catch(e){}
    }

    while ( oContainer )
    {
        if ( oContainer.nodeType == 1 && oContainer.nodeName.IEquals( nodeTagName ) ) return true ;
        oContainer = oContainer.parentNode ;
    }

    return false ;
}

// The "nodeTagName" parameter must be Upper Case.
FCKSelection.MoveToAncestorNode = function( nodeTagName )
{
    var oNode ;

    var oContainer = this.GetSelectedElement() ;
    if ( ! oContainer )
        oContainer = this.GetSelection().getRangeAt(0).startContainer ;

    while ( oContainer )
    {
        if ( oContainer.nodeName.IEquals( nodeTagName ) )
            return oContainer ;

        oContainer = oContainer.parentNode ;
    }
    return null ;
}

FCKSelection.Delete = function()
{
    // Gets the actual selection.
    var oSel = this.GetSelection() ;

    // Deletes the actual selection contents.
    for ( var i = 0 ; i < oSel.rangeCount ; i++ )
    {
        oSel.getRangeAt(i).deleteContents() ;
    }

    return oSel ;
}

/**
 * Returns the native selection object.
 */
FCKSelection.GetSelection = function()
{
    return FCK.EditorWindow.getSelection() ;
}

// The following are IE only features (we don't need then in other browsers
// currently).
FCKSelection.Save = function()
{}
FCKSelection.Restore = function()
{}
FCKSelection.Release = function()
{}
